Problem: Legs on Bus
There is a bus with 7 girls.
Each girl has 7 backpacks.
Inside each backpack, there are 7 big cats.
Each big cat has 7 small cats.
All the cats have 4 legs each.

Question: How many legs are inside the bus?

Solution
7x7 = 49 backpacks

49x7 = 343 big cats

343x7 = 2,401 small cats

343x4 = 1,372 big cats’ legs

2,401x4= 9,604 small cats’ legs

1,372 + 9,604 = 10,976 total legs